Detecting serial ports when program is already running
hi, i've tried detecting the available ports of my computer usingEnumeration portList = CommPortIdentifier.getPortIdentifiers ();
while (portList.hasMoreElements()) { ... }, i use it when my program starts to run and it works well. but i have a button which can give users option to change the port for which he wants to use.. and a port may not be available when the porgram started and may be available when the program is already running (i'm using a serial-to-USB cable so i can just plug and unplug it), i'm using the same code as above but it only detects the ports that i detected from the beginning, not including the new ports... does anyone know what i'm doing wrong? thanks!
just found my solution in one of the threads, i inserted try{
CommDriver cd= (CommDriver) Class.forName("com.sun.comm.Win32Driver").newInstance();
cd.initialize();
}catch(Exception e) {System.out.println("No available daw"); }before my Enumeration... my problem is solved!! Thanks for taking time to reply.
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==============================
I�ve been trying to test my application in Eclipse, and I am using threads. But when I debug it, sometimes the behavior is not what I am expecting. Sometimes when I stop at some breakpoint for a long time, the debug stops to execute. Curiously the application runs perfectly in run mode.
Has anyone had this problem?
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==============================
==============================
(m.winter)
Debugging threads works perfectly in eclipse. However be aware: If you just set a breakpoint by doubleclicking left to the source line, then its policy ist to stop the trhread, not the VM. That means, once you reach the breakpoint, only the thread reaching that line is stopped. All other threads continue running. If a second thread later also hits that line, it is also stopped. This makes it sometimes difficult to find out, where you are, as two or more threads may be suspended. You can see the status of the threads and switch between them in the treah view, typically in the upper half of the screen.
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==============================
==============================
(Peter-Lawrey)
If you have anything in your code which is time depend it can run fine, except when you debug it.
e.g. if one thread times out because you have stopped another thread.
==============================
==============================
Thanx, but I didn�t understand yet.
Sorry if I commit any English language error, I�m learning English.
Please try to debug the code below:
public class Main {
public static void main(String[] args) {
Shared objShared = new Shared();
Thread thread1 = new Thread(new Thread1(objShared));
Thread thread2 = new Thread(new Thread2(objShared));
thread1.start(); //put breakpoint here
thread2.start();
class Thread1 implements Runnable {
private Shared objShared;
Thread1(Shared shared) {
objShared = shared;
public void run() {
try {
objShared.doSomething1();
} catch(InterruptedException e) {
e.printStackTrace();
class Thread2 implements Runnable {
private Shared objShared;
Thread2(Shared shared) {
objShared = shared;
public void run() {
try {
objShared.doSomething2();
} catch(InterruptedException e) {
e.printStackTrace();
class Shared {
private boolean x = false;
synchronized void doSomething1()
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}"If you stay a long time at the breakpoint, finally you might run out of memory or something else happens" - I don�t wait a very long time. Just few seconds in the "while" breakpoint is enough to debug stops the execution.
"You can change the behaviour of a breakpoint to "suspend VM" - I did it, but in properties I didn�t find any thing to configure in order to debug perfectly.
In debug mode, when I press F6 button rapidly, this program is executed perfectly. The problem occurs only if the debug is stopped for few seconds in breakpoint. Try it, I�m really interested in the cause of this behaviour.
Thanks a lot!
==============================
I don�t know why does this behaviour occur! If anyone has the solution for my problem, please tell me!
************************************************************************************************************************** -
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Hi!
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regards
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CommPortIdentifier portId;
Enumeration en = CommPortIdentifier.getPortIdentifiers();
Vector v=new Vector();
while (en.hasMoreElements())
portId = (CommPortIdentifier) en.nextElement();
if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL)
v.addElement(portId.getName());
}refer this URL
http://www.java2s.com/Code/Java/Development-Class/ReadfromaSerialportnotifyingwhendataarrives.htm
* Project :
* Class : GUIFrame.java
* Purpose :
* Date_Created :
* @ Version 1.0
import javax.swing.JFrame;
// import javax.swing.JPanel;
import javax.swing.JMenuItem;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import java.awt.event.*;
import javax.comm.*;
import java.awt.*;
import javax.swing.*;
// import javax.swing.border.TitledBorder;
public class GUIFrame extends JFrame implements ActionListener
JButton connectPort;
JComboBox combo;
//JButton baudRate;
//JComboBox baudRateCombo;
public JTextArea textArea;
JButton sendData;
public SerialConnection serialConnection;
public GUIFrame()
setLayout(null);
setTitle("First Frame");
serialConnection = new SerialConnection();
setJMenuBar(createMenuBar());
combo = new JComboBox();
combo.setBounds(50, 50, 80, 25);
listPort();
combo.addActionListener(this);
connectPort = new JButton("Connect");
connectPort.setBounds(150, 50, 100, 25);
connectPort.addActionListener(this);
sendData = new JButton("Send Data");
sendData.setBounds(150, 150, 100, 25);
sendData.addActionListener(this);
textArea = new JTextArea();
textArea.setBounds(300, 300, 400, 300);
textArea.setFont(new Font("sansserif",0,18));
add(connectPort);
add(combo);
add(sendData);
add(textArea);;
setSize(400, 300);
setVisible(true);
addWindowListener(new MainWindowAdapter());
public static void main(String arg[])
System.out.println("Hi");
new GUIFrame();
public JMenuBar createMenuBar()
JMenuBar menuBar = new JMenuBar();
JMenu fileMenu = new JMenu("File");
JMenuItem connectMenuItem = new JMenuItem("Connect");
connectMenuItem.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae){
try{
if(serialConnection.portName == null){
serialConnection.portName = combo.getSelectedItem().toString();
serialConnection.openConnection();
catch(Exception ex)
JMenuItem disconnectMenuItem = new JMenuItem("Disconnect");
disconnectMenuItem.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae){
try{
serialConnection.closeConnection();
catch(Exception ex)
fileMenu.add(connectMenuItem);
fileMenu.add(disconnectMenuItem);
menuBar.add(fileMenu);
return menuBar;
public void listPort()
CommPortIdentifier portId;
java.util.Enumeration enumeration = CommPortIdentifier.getPortIdentifiers();
while(enumeration.hasMoreElements())
portId = (CommPortIdentifier)enumeration.nextElement();
if(portId.getPortType() == CommPortIdentifier.PORT_SERIAL)
if(!portId.isCurrentlyOwned())
combo.addItem(portId.getName());
public void actionPerformed(ActionEvent ae)
if(ae.getSource() == connectPort)
System.out.println("Connect is clicked");
try
if(serialConnection.portName == null)
serialConnection.portName = combo.getSelectedItem().toString();
serialConnection.openConnection();
catch(Exception ex)
if(ae.getSource() == combo)
System.out.print("Port Name = " + combo.getSelectedItem().toString());
serialConnection.portName = combo.getSelectedItem().toString();
if(ae.getSource() == sendData)
byte b[] = new byte[5];
b[0] = (byte)0xaa;
b[1] = (byte)0xbb;
b[2] = (byte)0xcc;
b[3] = (byte)0xdd;
b[4] = (byte)0xee;
try
serialConnection.getOutputStream().write(b);
display(b);
catch(Exception ex)
public class MainWindowAdapter extends WindowAdapter
public void windowClosing(WindowEvent win)
dispose();
System.exit(0);
public void display(byte[] b)
for(int i=0; i< b.length; i++)
textArea.append(Integer.toHexString (b[i] & 0xff) + " ");
textArea.append("\n");
* Project :
* Class : SerialConnection.java
* Purpose :
* Date_Created :
* @ Version 1.0
import javax.comm.*;
import java.io.*;
public class SerialConnection
private OutputStream os;
private InputStream is;
private CommPortIdentifier portId;
public SerialPort sPort;
private boolean open;
public String portName;
SerialConnection serialConnection;
public SerialConnection()
serialConnection=this;
PortHandler portHandler = new PortHandler(serialConnection);
portHandler.init(serialConnection);
public void setOutputStream(OutputStream os)
this.os=os;
public OutputStream getOutputStream()
return os;
public void setInputStream(InputStream is)
this.is=is;
public InputStream getInputStream()
return is;
* A Method to open the SerialConnection
public void openConnection() throws Exception
try
portId = CommPortIdentifier.getPortIdentifier(portName);
catch (javax.comm.NoSuchPortException e)
System.out.println("noPort : "+e);
try
sPort = (SerialPort)portId.open("port", 3000);
open = true;
catch (javax.comm.PortInUseException e)
throw new Exception();
try
setOutputStream(sPort.getOutputStream());
setInputStream(sPort.getInputStream());
System.out.println("IO stream is opened");
catch (java.io.IOException e)
sPort.close();
*A Method to Close the port and clean up associated elements.
public void closeConnection()
// If port is already closed just return.
if (!open)
return;
if (sPort != null)
try
this.os.close();
this.is.close();
System.out.println("IO stream is opened - CloseConnection");
catch (java.io.IOException e)
System.err.println(e);
sPort.close();
System.out.println("Port is closed");
System.out.println("Flag Open - 1 : " + open );
open = false;
System.out.println("Flag Open - 2 : " + open);
* Send a one second break signal.
public void sendBreak()
sPort.sendBreak(1000);
* Reports the open status of the port.
* @return true if port is open, false if port is closed.
public boolean isOpen()
return open;
* A Method to add the event listener to the SerialPort
public void addEventListener(java.util.EventListener listener)throws Exception
System.out.println("Is not in opened state");
if(isOpen())
System.out.println("Is in opened state");
try
sPort.addEventListener((javax.comm.SerialPortEventListener)listener);
catch (java.util.TooManyListenersException e)
sPort.close();
// Set notifyOnDataAvailable to true to allow event driven input.
sPort.notifyOnDataAvailable(true);
// Set notifyOnBreakInterrup to allow event driven break handling.
sPort.notifyOnBreakInterrupt(true);
// Set receive timeout to allow breaking out of polling loop during
// input handling.
try
sPort.enableReceiveTimeout(50);
//sPort.enableReceiveTimeout(-1);
catch (javax.comm.UnsupportedCommOperationException e)
e.printStackTrace();
// Add ownership listener to allow ownership event handling.
portId.addPortOwnershipListener((javax.comm.CommPortOwnershipListener)listener);
import javax.comm.*;
public class PortHandler implements SerialPortEventListener,CommPortOwnershipListener{
public SerialConnection serialConnection;
public PortHandler(SerialConnection serialConnection)
this.serialConnection=serialConnection;
try{
serialConnection.addEventListener((SerialPortEventListener)this);
System.out.println("New Port Handler is called");
catch(Exception e)
System.out.println("Exception PortHandler(); " +e);
e.printStackTrace();
// Add this object as an event listener for the serial port.
System.out.println("PortHandler is initialised...");
public SerialConnection getConnection(){
return serialConnection;
public void setSerialConnection(SerialConnection serialConnection){
this.serialConnection = serialConnection;
public void init(SerialConnection serialConnection){
setSerialConnection(serialConnection);
public void serialEvent(SerialPortEvent e){
System.out.println("Event Initialised");
//Determine type of event.
switch (e.getEventType())
case SerialPortEvent.DATA_AVAILABLE:
try{
readData();
catch(java.io.IOException e1)
System.out.println("IO Excep "+e1.getMessage());
e1.printStackTrace();
catch(Exception e1)
System.out.println("Exception from Serial Event "+e1.getMessage());
e1.printStackTrace();
break;
case SerialPortEvent.BI:
break;
public void readData() throws java.io.IOException
byte b[]=new byte[8500];
int i=0,selectOption=0;
int newData=0;
int doubleLength=0;
int length=0;
// String mid="",strLen="";
while (newData != -1)
try
System.out.println("getInputStream().available() : " + serialConnection.getInputStream().available());
newData = serialConnection.getInputStream().read();
System.out.println("newData\t"+newData);
if (newData == -1)
System.out.println("\n End of the File\n");
break;
if(i==0){
b=(byte)newData;
System.out.print("\n MSg ID \t= " + Integer.toString(newData&0xff,16)+"\n----------------------------");
if(b[0] == (byte)0x00)
i=-1;
i++;
continue;
i++;
//System.out.println("Method is called - selectOption : " + selectOption);
continue;
if(i==1)
b[i]=(byte)newData;
System.out.print("\n Length =\t"+Integer.toString(newData&0xff,16)+"\n----------------------------");
length=newData;
if(length == 0)
i=0;
continue;
i++;
continue;
b[i]=(byte)newData;
if((b[0] == (byte)0x07) && (i == 2) || (b[0] == (byte)0xaf) && (i == 2) || (b[0] == (byte)0xec) && (i == 2)
|| (b[0] == (byte)0x5c) && (i == 2) || (b[0] == (byte)0xbe) && (i == 2) )
String string = String.valueOf((byte)b[0]);
String strLen = Integer.toString(b[2]&0xff,16) + Integer.toString(b[1]&0xff,16);
System.out.println("\n\nLength String = " + strLen + "\n\n");
java.math.BigInteger bi=new java.math.BigInteger(strLen,16);
strLen = bi.toString();
doubleLength = Integer.parseInt(strLen);
System.out.println("\nLength int = " + doubleLength + "\n");
//System.out.println("Method is called");
i++;
// Added by Siva on Jan 06
switch(selectOption)
case 0:
if(i>length+1)
try
b[i]=(byte)newData;
System.out.print("\nThe Last Byte =\t"+Integer.toString(newData&0xff,16)+"\n----------------------------");
System.out.print("\n"+i+" i Value =\t"+Integer.toString(newData&0xff,16));
System.out.println("\n----------------------- FINISHED------------------------------");
// service(b);
System.out.println("\n----------------------- After Service------------------------------");
i=-1;
i++;
continue;
}catch (Exception e)
System.out.println("Exception in calling service 0:"+e.getMessage());
e.printStackTrace();
b[i]=(byte)newData;
System.out.print("\nMSg ID \t= "+Integer.toString(newData&0xff,16)+"\n----------------------------");
break;
}catch (java.io.IOException ex) {
System.err.println("Abstarct Port handler Exception\t"+ex);
catch(Exception e1)
System.out.println("Exception from Read Data "+e1.getMessage());
e1.printStackTrace();
System.out.println("-----------------------------");
public void ownershipChange(int type){
if (type == CommPortOwnershipListener.PORT_OWNERSHIP_REQUESTED){
public void destroy()
try{
serialConnection.closeConnection();
}catch(Exception e){
System.out.println("Exception 2:"+e);
e.printStackTrace();
public void finalize(){
destroy(); -
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Message was edited by: Firesign3000 -
my home computer says :when i try to use the firefox icon , it's say that the system is already running ,and i dont know how or what programs are already running,it just simply keep telling me the same thing over and over when i use the icon, what should i do to correct this and gain access to firefox once again....
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Hi, How to search / scan the Source code of Function module for any function modules used in it. Scenario : There is a Function module called ztestfm. In the source code of ztestfm, if it is using other fucntion module ( Ex : CONVERSION_EXIT_
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[internalization] cannot get the correct local lang
Hi there, I'm trying to develop an application based on the Internalization tutorial. I'm not getting any errors by the server, but the application doesn't change the local language. In the HTTP monitor I've got the following header parameter sent by
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Refurbished Mini--Won't Configure
I put in the install disk and stuff and when it gets to the Configuration it won't read it. Whenever I try to turn it on I get the ipod support address.
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Hello All, I need to register MDM system in my PI 7.1 SLD, so i need to know, i should be doing this by adding as Standalong system type option or can i also do it with SLDREG? I did read a note # 1018839 regarding SLDREG and as per it.."The "receivi
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Ipod appearing in Itunes but songs aren't transferring
I just got a new computer, and when I plug in my nano, the iTunes program recognizes it, but when I try to transfer songs over, they do not go on the iPod and a little "x" shows up. Help!